At Whitney Portal, find the trailhead for the Mount Whitney Trail located below the Whitney Portal Store. Climb along the North Fork of Lone Pine Creek along several long switchbacks. Pass Lone Pine Lake at 2.8 miles.
At 3.5 miles you'll reach Bighorn Park, a scenic meadow with granite cliffs on both sides. A short while later is Outpost Camp at 3.8 miles.
Continue climbing through the increasingly rocky landscape to Trail Camp at 6.3 miles. Trail Camp is popular with Whitney climbers doing overnight trips.
Past Trail Camp are the infamous 99 switchbacks that climb the granite slope to Trail Crest, at 8.5 miles and 13,645 feet - the highest trail pass in the United States. You'll get your first views west of the mountains, and they are spectacular.
Once you've come this far, it's a close jaunt to the summit of Mount Whitney, but you'll need to transition to the John Muir Trail to get to the top. Check out the Mount Whitney via Mount Whitney Trail
run for full information.